Description

What happened:
I was mining to the last of a diamond pick, it broke and I went to replace it with a new one. When I placed the new pick in the slot the old one reappeared and I was able to place it back in my bar. Sometimes I can use the pick, have it break, reappear and be reused several times before it breaks for good. As the pick breaks no breaking sound is heard.

What I expected to happen:
My pickaxe breaks... The end...

How to reproduce:
This seems very intermittent, there seems to be no link to anything. It's not every pick and I haven't noticed it on other items.